JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2): 155-165.doi: 10.12302/j.issn.1000-2006.202203017

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Differences in resistance of Catalpa bungei cultivars to stem rot

ZHU Yanyan(), JIA Ruirui, FU Yu, CHANG Lin, YUE Yuanzheng, YANG Xiulian, WANG Lianggui*()   

  1. College of Landscape Architecture, Nanjing Forestry University,Jiangsu Provincial Key Laboratory of Landscape Architecture,Nanjing 210037,China
  • Received:2022-03-06 Revised:2022-04-19 Online:2024-03-30 Published:2024-04-08

Abstract:

【Objective】 To investigate the differences in resistance to Phytophthora nicotianae (strain QS.1) infestation by Catalpa bungei cultivars and breeding methods, providing basis for C. bungei introduction and cultivation and disease resistance breeding. 【Method】 The annual seedlings of ‘Jinsiqiu’ (JSQ),‘Qiuza 1 hao’ (QZ),‘Yuqiu 1 hao’ (YQ),‘Luoqiu 1 hao’ (LQ-Z)tissue cultured seedlings,and cutting seedling‘Luoqiu 1 hao’(LQ-Q),‘Qiu5-8’(Q5-8), ‘Qiu 8-1’(Q8-1),six C. bungei cultivars were used as experimental materials and infested with P. nicotianae strain QS.1 to determine relevant osmotic substance content,protective enzyme activity and photosynthetic gas parameters. 【Result】 After infection 2-4 d by strain QS.1,all C. bungei cultivars tested were susceptible to the disease and in the case of seedlings ‘Qiuza 1 hao’ and ‘Yuqiu 1 hao’ had the weakest resistance to the disease caused by the strain QS.1,while ‘Jinsiqiu’ had the strongest resistance to the disease; as far as the cuttings of C. bungei cultivars were concerned,Q5-8 and Q8-1 were more resistant to the infection of strain QS.1; ‘Luoqiu 1 hao’ cuttings were more resistant to the disease than the histoculture seedlings,and the cuttings of other species had stronger resistance to QS.1 infection than the histoculture seedlings,except for‘JSQ’.【Conclusion】 There were differences in infection pathogenesis among different C. bungei cultivars after inoculation. The pathogenic ability of different C. bungei cultivars against P. nicotianae strain QS.1 is related to the maintenance of photosynthetic performance and the regulation of defense-related enzyme activities.

Key words: Catalpa bungei cultivars, Phtophthora nicotianae (strain QS.1), resistance difference, physiological index, propagation method

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